Why Should I Want More Than I Have?

The follow-up to the "want" list was to create a list of 10 things you want from the person with whom you are in a relationship. According to the directions, after my wife and I create these lists, we are supposed to get together and share them, then each agree on three things we want from the other.
I'm stuck logistically on this because my wife hasn't caught up on the homework, but I'm also stuck conceptually. My wife and I talked about this assignment last night, and we aren't sure if we can each come up with 10 things we want from the other -- if the rule implies that they have to be 10 things we don't already have. The assignment doesn't explicitly say these have to be things we don't already have, but it does say the sharing should be in terms of a "request."
The implication is that we all have unfulfilled wants in our lives and in our relationships. I'm not sure this is so -- at least not to the degree implied in the assignment.
So how do you complete the homework if you don't want what you haven't got? We agreed that when she gets caught up and the time comes, we won't be bound by the rule that the requests have to be for things we are "missing" in our lives. We'll just share what we want out of our marriage, and know that in most cases we already have it.